414 GUSTAF FR. GOTHLIN 
animal is still unable to keep itself in a vertical position for any 
appreciable length of time. 
6. Beroé, 20 mm. long, with a normal ciliary motion swims 
around in the aquarium just below the surface of the water. 
At 4h. 6 m. the animal is transferred to a cuvette containing 
sea-water to which ethyl ether has first been added in the propor- 
tion of 3 volumes to 1000, after which the mixture has been 
shaken up in a closed bottle. The cuvette is covered with a glass 
lid. 
4h.7m _ After the transference to the cuvette the number of 
ciliary waves is greatly decreased. Some ciliary waves die off 
at a short distance from the sensory pole. 
4h.8m. The animal makes powerful contractions, by which 
a secondary inhibition is caused, which is a total one. ‘Tempera- 
ture in the cuvette, 20.3°. 
4h. 11m. The contractions are repeated. The swimming 
plates are still. 
4h.14m. A single ciliary wave is visible in two rows. 
4h. 15m —4 h. 21 m. The body is contracted at intervals 
varying between 4 and 80 seconds. Now and then there is seen 
nearest to the sensory pole on some row a ciliary wave that expires 
after a course of a few millimeters; otherwise the ciliary plates 
are still. 
4h. 25m. The contractions of the body become more and 
more infrequent For long periods the rows of swimming plates 
are quite on the surface, but nevertheless they are still. 
4h. 28m. Ciliary waves now begin to run regularly along a 
single row; frequency = 12/20 sec. = 36 per min. 
4h.31m. The animal’s shape is now normal, but in spite of 
that, apart from the row just mentioned, one sees only sporadic 
movements in the smallest swimming plates nearest to the 
sensory pole. 
4h.38m. Although slight contractions of the body still occur, 
regular ciliary waves now extend over the whole length of three 
rows and over almost half the length of one row. 
4h.42m.4hr.45m. On the row (the uppermost one) where 
the waves are the most frequent 30/40 sec. = 45 per minute are 
